Vertical conveyer oven



March 8, 1938. w. v. BAKER VERTICAL CONVEYER OVEN Filed Feb. 1, 1957 2 Shets-Sheeh 1 Snventor Gttdrneg March 8, 1938. w. v. BAKER VERTICAL CONVEYER OVEN FiledFeb. 1, 1937 2. Sheets-Sheet 2 Patented 8, 1938 UNITED STATES PATENT OFFICE vnn'rrcar. oonvaraa oven Wedworth V. Baker, Detroit, Mich. Application February 1, 1937, Serial No. 123,549

Claims. an. 34-12) My invention relates to vertical conveyer ovens and an object is to improve the operation of heating, cooling, and oxydizing cores passing through said oven and in this connection the employment 5 of a plenum chamber and horizontal currents. In the accompanying drawings:

Figure l is a diagrammatical vertical central section of an oven embodying my invention.

Figure 2 is a detail section on line 2--2 of Figure 1.

Figure 3 is a detail section on an enlarged scale of that portion of Figure 1, enclosed by the broken line 3-3-3-3, with the carriers at a somewhat lower level.

Figure 4 is a detail section on the line 4-4,

Figure 2. v

Referring now to the reference numerals on the drawings:---

2 indicates the enclosed upper portion oi the oven casing. The numeral 4 denotes a dilution chamber shown as concentric with the casing 2, and Al is a suction chamber. The numeral .5 designates a plenum chamber. Numeral 3 denotes a combustion chamber shown here as 10-- cated within the dilution chamber 4.

Numeral 6 denotes a conveyer apparatus,.the

carriers 6a, of which, rise at the left of the dilution chamber 4, and descend at the right thereof as indicated by arrows in Figure 1. Numeral I designates a vent stack and la, are openings thereinto from the casing 2. Numeral 2! denotes an automatic damper in a passage between the casing 2 and stack I, which closes by an air, or

electric motor, when the temperature reaches an arbitrary limit (say 200") and again opens automatically when the temperature drops to say 195. The casing is open to the atmosphere'when the apparatus isnot in operation.

Numeral 8 denotes openings in the right'hand wall of the casing 2, controlled by horizontally operating valves 8a; and 9, are openings in the right hand wall of the suction chamberAl, opposite the openings 8, and correspondingly controlled by the horizontally operating valves The numeral Iii designates openings through the left hand wall of the plenum chamber 5, and ii designates corresponding openings through the left hand wall of the casing 2, opposite the openings iii. The openings Ill and II are controlled. by horizontally operating valves, respectively Ila and I la. All of the openings Ill, except the lowes one open into the plenum chamber 5'.

Numeral l3 denotes a valve adapted to control the area of passage between the right han'dwall of the suction chamber Al, and the opposite wall ofthe plenum chamber 5. The valve I3 is located below the upper opening 9. Numeral it indicates an opening through the right hand wall of the dilution chamber 4, above the upper end of the plenum chamber 5. Numeral i5 designates 5 a swinging valve adapted to regulate the area of passage through the opening l4.

Numeral l2 indicates a housing covering the openings ll. Numeral I6 indicates a centrifugal fan, its intake passage communicating by a pipe '10 with the interior of the housing l2, and by a branch pipe It, with the suction chamber A4 at No. Numeral l9 denotes stack with which the discharge port oi the blower i6 communicates.

Numeral 20 denotes a second centrifugal fan, or 15 blower, its intake port communicating through a pipe 2| with the upper end oi the dilution chamber as indicated at 2|a.

Numeral 22 denotes a pipe connecting the discharge port of the blower 20 with the plenum. 20 chamber 5 at 23.

The combustion chamber is a refractory box, usually with steel plate outsides. The gas or oil .burner is usually a nozzle type mounted outside the end wall, projecting its flame inside, and 25 through a checkered or slotted top slat into the dilution chamber. 1 i

. If electricity were the source of heat, the elements would be located where the heater is shown.

The heater might even be located outside of the 30 I casing and still give the benefits of the design by connecting the circulating system between the pressure and exhaust chambers.

' The operation of the above described'apparatus r is as. follows: 35

Hot air having aproper amount. of oxygen thereinis taken from the upper end of the. exhaust chamber 4 and projected into the plenum chamber 5 by the blower 20. The required oxygen r is supplied by fresliair taken in through the open- 40 ins H. r upp r n g -9.- o'r' both. th pply beingreguiatedby manipulating thevalves l3 and I5. 'Theblowerit draws the gases from the suction chamber A4. and the housing 12.. Y

The corespas'sing .upv at theleft, aresubjected -45 i to horizontal currents of-gases passingjoutof the. plenum-chamber throughthe openings in and being drawn into'the opposite'openings, Ii and discharged through the stack l9.- Y I 'If a, further recirculationof gasesisrequired 50 1 a 'pipe may lead from the discharge port of the blower I to the upper endlq the'dilution chamher! as shown in Figure 1 in broken lines. The cores passing. downward at. the right'are cooled by horizontal currents of air entering the 55 casing 2 through openings 8 and into the suction chamber and in the other direction on the other side of said chamber, a plenum chamber, said plenum chamber having an opening to said casing on one side of said dilution chamber and said dilution chamber having an opening to'said casing on the other side of said dilution chamber, a heater in said dilution chamber, and means for drawing gas from said dilution chamber and I forcing it into said plenum chamber.

2. In an apparatus of the kind described, a casing, a dilution chamber in said casing, an apparatus adapted to convey carriers in said casing in one direction on one side oi said dilution chamber and in the other direction on the other side of said chamber, a plenum chamber, said plenum chamber having an opening to said casing on one side of said dilution chamber and said dilution chamber having an opening to said casing on the other side of said dilution chamber, a, heater in said dilution chamber, and means for drawing gas from'sai'd dilution chamber and forcing it into saidple'nu'm chamber, and means for adjusting the area of said openings.

3. In an apparatus of jthe'kind described, a casing, a dilution chamber in said casing, an apparatus adapted to convey carriers in said casing in one direction on one side of said dilution chamber and in the other direction on the other side of said chamber, a plenum chamber, said plenum chamber having an opening to said casing on one side of the dilution chamber and said dilution chamber having an opening to said casing on the other side 01' said dilution chamber, a heater in said dilution chamber, and means for drawing gas from said dilution chamber andv forcing it into said plenum chamber, and means for severally adjusting the area of said openings. 7 4. In an apparatus of the kind described, a casing, a dilution chamber in said casing, an apparatus adapted to convey carriers in said casing in one direction on one side 01' said dilution chamber and in the other direction, on the other side of said chamber, a plenum chamber, said plenum chamber having an opening to said casing on one side of said dilution chamber and said dilution chamber having an opening to said casing on the other side of said dilution chamber, a heater in saiddilution chamber, and means for drawing gas from said dilution chamber and forcing it into said plenum chamber, said casing having an opening through its wall opposite said opening from said dilution'chamber.

g 5. In an apparatus of the kind described, a casing, a dilution chamber in said casing, an apparatus adapted to convey carriers in said casing in one direction on one side of said dilution chamber and in the other dir ction on the other side of said chamber, a plenum chamber, said plenum chamber having an opening-to said casing on one side of said dilution chamber and said dilution chamber having an opening to said casing on the other side 01 said dilution chamber, a heater in said dilution chamber, and means for drawing gasfrom said dilution chamber and forcing it into said plenum chamber, said casing,

having an opening through its wall opposite said opening from said dilution chamber, and an 1 opening from said casing opposite said opening from said plenum chamber, a housing outside of said casing enclosing the last named opening from said casing, and means for maintaining a 

